Cruise inventory

FRV Clupea 0573C

Cruise summary report

Cruise Info. 
Ship name (ship code)FRV Clupea (74CU)
Cruise identifier0573C
Cruise period1973-05-09 — 1973-05-25
StatusCompleted
Port of departureBuckie, United Kingdom
Port of returnBuckie, United Kingdom
PurposeTrials
Objectives1. To survey the ground approximately 10 miles NNE of Lossiemouth, select an area suitable for noise measurement work and to lay and calibrate a hydrophone range.
2. To make measurements of the noise generated by
a) pair trawls, and
b) a Danish seine net towed over the range.

A preliminary echosounder survey of the seabed was made NNE of Lossiemouth and several grab samples of the seabed were obtained.
Chief scientistAnthony D Hawkins (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory)
Cruise reportFRV Clupea 0573C cruise report cl5_73.pdf — access key 'C' (0.11 MB) 
Ocean/sea areas 
GeneralNorth Sea
SpecificEast of Lossiemouth, Spey Bay area
Measurements 
Biology and fisheries 
Gear researchQuantity: number of deployments = 5
Description: Hydrophones, approximately 100m apart were laid and attached to a line stretched between two anchored dahns.
Gear researchQuantity: number of deployments = 4
Description: Noise measurement runs for the pair trawling noise trials, made with the 'Bracoden' steaming alone over the range under different rpm and propeller pitch conditions
Gear researchQuantity: number of hauls = 3
Description: Seine net shots performed in the region of the hydrophone array. The first was performed with a single pinger attached to the headline of the net, and the second with four pingers arranged along the port rope. The third utilised a headline-mounted pinger, but in addition three divers made concurrent observations on the gear
Gear researchQuantity: number of deployments = 3
Description: 2 noise measurement runs towing a 32" mesh Appeldoorn gear, 1 haul was carried out using instruments attached to the 32" mesh gear to measure the geometry of the net and its fishing depth
Gear researchQuantity: number of deployments = 3
Description: 'Bracoden' and 'Replenish' noise measurement runs made. 2 with the hips towing a 24" mesh Appeldoorn gear, and 1 with them towing a Cosalt gear
Moorings, landers, buoys 
Biology and fisheries 
Gear research57° 42' 59" N  3° 12' 0" W — A range was laid consisting of 4 widely spaced hydrophones approximately 500 m apart, laid around the 'Mara's' anticipated fishing area